YOU SAID:

my sisters are at least 4 years older than me

INTO JAPANESE

私の姉妹は私より少なくとも4歳は古いです

BACK INTO ENGLISH

My sister is at least 4 years older than me.

INTO JAPANESE

私の妹は 4 歳年上です。

BACK INTO ENGLISH

My sister is four years older.

INTO JAPANESE

私の妹は 4 歳年上です。

BACK INTO ENGLISH

My sister is 4 years older.

INTO JAPANESE

私の妹は4歳です。

BACK INTO ENGLISH

My sister is four years old.

INTO JAPANESE

私の妹は4歳です。

BACK INTO ENGLISH

My sister is four years old.